cat's diet eight months ago my cat has an operation (castration). Soon it became very fat & i noticed that some condensation appeared under the skin on it's abdomen. I was afraid that was humor. Today i put my cat into the bag &brought it to the doctor. She sad me, that this condensation is just fat, and it nesessary for my cat to loose weight (it weight's 5.3 kg!). So my cat on the diet from now!